Door fastener operating means



' July 9, 1957 F. DOLL v v 2,798,752

DOOR FASTENER OPERATING MEANS Filed April 2'7, 1953 as 34 35 a7 29 J/WEN0R. FRANZ 4 A7TORNE Y.

2,798,752 Patented July 9, 1957 United States Paw @filicc by mesneassign- Pittshnrgh, Pa., a

The present invention relates to door fasteneroperatingmeans for thedoors of horizontal coking chambers or other ovens, in which the doorbody, or a sealing part carried thereby is, in the closed condition ofthe door, held gas-tight against the door frame by means of springpressure applied between the door, or door part, and a latch, and alatch screw for the latch is located outside the pressure path betweenthe fastener spring means and. the latch, whereby the spring means canbe compressed, without the exertion of pressure on the latch screw, bymovement of the latch.

Doors of this character have been found very satisfactory since theyenable a uni-form sealing pressure to be obtained and to beautomatically re-instituted each time the door is re-set in the ovenmouth, whilst the sealing pressure exerted by the fastener spring meanscan be adjusted, if need be, at any time after the door has been set inthe oven mouth.

It is an object of this invention to provide fastener means of thischaracter in which the latching and unlatching operations can beperformed optionally by rota-ry movement manually or by an axialmovement automatically from a machine movable from one oven to another.

Other features of the forth.

, A preferred embodiment of the invention is illustrated in'theaccompanying drawings, wherein Fig. 1 is a horizontal section through adoor inserted in the mouth of an oven chamber and having door fas teneroperating means in accordance with the present invention, and

Fig. 2 is an enlarged section of a detail of the mechanism seen in Fig.1.

The door illustrated has a refractory plug 1 which enters the ovenchamber 3 defined between side Walls designated 2. Along thelongitudinal sides of the oven batterythe masonry is clad with ametallic reinforcement 4 against which is applied and held, by screws orthe like not illustrated in the drawings, a cast iron door frame 5surrounding each chamber mouth. A resilient sealing frame 7 of angularformation in cross section is connected to the door and, when the latteris closed, bears in sealed fashion against the sealing surfaces, as 6 ofthe door frame.

The refractory door plug 1 is held in clamped relation on the door by acast iron carrier frame 8 which is rigidly connected to a plate 9forming the front of the door. Bearings 10 are firmly secured to thisplate at each of its upper and lower parts. Each of these bearings 10has a central bore 11 in which is screwed a threaded boss 12 for thelatch. This boss carries at its other end, that projects forwards fromthe bearing 10, a pressure imparting sleeve 13, which is axiallydisplaceable on the boss 12 and has the closure and fastener latch 14rockably mounted thereon. In the closed condition of the door, the twoends of the latch 14 are disinvention are hereinafter set 2 t t posedbehind :hooks ,15 which are rigidly connected to the oven body, forexample to the door frame 5 secured to the oven body reinforcement- 4.

At its outer end the boss 12 isfurnished with flat surfaces 16 adaptedto receive a key for'rotating the boss 12. This boss further has anaxial bore 17 in which is axially movable a latch screw bolt 18 threadedat 19. The inner or rear endpart of the latch screw bolt 18 is formed asa smooth stem '20 which isfurnished with an annular groove 21. At itsouter or forwarded part the latch screw bolt 18 has a collar 22,adjoined by a head 23 having flat surfaces for engagement by a key orlike-tool for the purpose of tightening or releasing the mechanisms ashereinafter referred to.

The pressure impartingsleeve 13 'is provided at its forward end with aflare or flange 24 which, when the door is in the closed condition, islocated in the vicinity of, but with a clearance axially from, thecollar 22 of the latch bolt 18, and remains ina correspondingly formedrecess 25u-inuthelatch 14 and spaced from the wall of this recess. Apressuretransmitting disc 27 bears against a bossed central portion ofthe latch 14 and transmits thereto the force of closure spring means 28,in the form of asetof plate springs, which is applied under pressureagainst this disc 27. With the door in the closed condition described,the inner end of the pack of fastener springs is also applied against ashoulder 29 formed on the boss 12.

The fastener springpack is surrounded by a cylindrical extension 30 ofthe bearing 10 forming a housing for the springs, this part 30 beingprovided, at a plurality -of .places, with :longitudinal slots 31. Alocking or safety screw-32, which is screwed into a t'ap'ped hole 33 inthe boss 12, passes through'one 'of the longitudinal slots 31 and hasa-bore 34 through which is passed a pin 35. This pin -35 is surroundedby a compression spring 36, located -in an annular gap 37 between thepin 35 and theinner wall of the bore 34, and the spring is applied atoneend 38 against the body of the locking screw 32 and at the other end"against a plunger head 39 on the pin 35. The outer end of the head 39is shaped in conformity with the annular groove '21 in the stem-20 ofthe latch screw bolt 18.

At its end opposite to head 39the pin 35'is provided with a hand grip40=which is disposed in a recess 41 in the body of the locking screw32,the latter also having, transversely disposed in relation to the recess41, a

further recess or groove 42 in which the hand grip '40 can be disposedto retain it when it is retracted to withdrawand hold the pin head39 outof the annular groove 21 in the stem 20 of the latch screw bolt 18.

When the pin 35 and its head 39 are in the condition illustrated in thedrawings with the head in the groove 21, the latch screw bolt 18 is heldagainst axial displacement. In thenormal operation of the door,compression *of the fastener springs 28 is effected automatically, forthe purpose of unl'atching the door, by axial movement of the pressuresleeve. 13 by a pressure-applying means, not

illustrated =in-the -drawing,;which acts to impart a thrust,

on the flange 24 of sleeve 13. The last mentioned motion, which is takenby sleeve 13, as a result of the thrust then applied, is greater thanthe clearance 26 in the recess 25, between the fastener latch 14 and theflange 24 of the sleeve 13, so that the latch 14 is somewhat retractedfrom the position in which it leans against the latching hooks 15. Thisenables the latch 14 to 'be rocked on sleeve 13 and the door 1 to bewithdrawn from the mouth of the oven chamber 3.

For hand latching and unlatching, when required, for example in theevent of failure of the above indicated pressure means for automaticallyoperating on the sleeve 3 13, a key is applied for operation by hand tothe head 23 of the latch screw bolt 18, and the pin head 39 is withdrawnfrom the annular groove 21 of said latch screw bolt 18. Turning of thekey rotates screw bolt 18 axially inward until collar 22 presses sleeve'13 in to take the pressure of springs 28 off latch bar 14 and hence offhooks 15. When latch 14 is out of hooks 15, and sleeve end 24 is notheld in, by means applied to head 23, or part 24, the bevelled collar 22arrests the outward movement of sleeve end 24, and hence, also theoutward movement of disc 27, and springs 28.

The closure pressure exerted by the fastener springs 28 is set byadjusting the position of the boss 12 in its hearing 10, whichadjustment is done by means of a key engaged of the end 16 to rotate theboss in or out. To permit this to be done, the locking, or safety screw32 has to be screwed out of the tapped hole 33 in the boss to permitsuch adjustment, and in addition the latch screw 18 is then removed sothat the latch 14 and the pressure imparting sleeve 13, which mustlikewise be movedaway from the boss 12, may be removed when the latchscrew 18 has been removed to permit access of the key to the end 16. Thelocking screw 32 can readily be screwed out of tap 33, by means of thehand grip 40, into a position to permit this adjusting operation.

With the door in closed condition, the pressure disc 27 forms, with thelatch bar 14 and hooks 15, a bar to the expansion of the spring means 28in the absence of sleeve 13 and bolt 18, and the shoulder 29 and thelocking screw 32 can readily be reset in relation to the bearing toalter the tension of springs 28.

When the boss 12 has been adjusted, the pressure sleeve 13 and the latch14 are inserted and the locking screw 32 screwed into the recess 33 inthe boss 12, the head 39 of this screw projecting into the bore 17 ofthe boss 12. The latch screw bolt 18 is next screwed into the boss 12until the rounded head 39 of the safety screw, which slips over thebevelled end of the latch screw bolt 18, is forced into the annulargroove 21 and further axial movement, and hence further rotation of thelatch screw bolt 18 is made impossible. In this way the latch screw bolt18 is brought into the adjusted position required for axial displacementof the pressure ring 27 for the purpose of compressing the fastenersprings to the extent required for sealing.

What I claim is:

1. Door fastener operating means for eifecting the latching andunlatching of the doors of horizontal coking chambers, or other ovens,in which a door part is adapted to be held against a door frame for thedoor under spring pressure of spring means applied between a latch andthe door part when the door is closed, and in which said door fasteneroperating means comprising a boss which carries the latch and which isaxially adjustable in a bearing that is fixed relative to the boss foradjusting the tension of the spring pressure exerted on the latch inlatching thedoor, and a latch screw bolt axially adjustable in said bossand having a counteracting Surface disposable, on axial adjustment ofthe latch screw bolt, into position for exerting a counterfor-ce on thespring means in unlatching' the door to overcome the spring pressureexerted on the latch as aforesaid.

2. Door fastener operating means for the doors of horizontal cokingchamber, or other ovens, comprising a fixed bearing carried by the door,a boss member carried by said bearing 50 as to project forwardlytherefrom, a latch screw member engaged in said boss so as to be axiallymovable relatively thereto, compression spring means arranged betweensaid boss member and a portion of said latch screw member, and a latchmounted around said latch screw member with said latch interposed in thepath of pressure between the spring means and said portion of said latchscrew member.

3. Door fastener operating means according to claim 2,- including alocking screw carried in said fixed bearing and detachably engageablewith the boss to prohibit axial movement thereof in the bearing.

4. Door fastener operating means according to claim 3, in which thelocking screw is adapted also to engage said latch screw member and holdit against axial displacement relatively to said boss.

5. Door fastener operating means according to claim 4, in which thelatch screw member comprises an annular groove for coaction with thelocking screw, and in which said locking screw comprises a spring-loadedpin passing therethrough having a head for sliding engagement in theannular groove in the locking screw.

6. Door fastener operating means according to claim 5, in which said pincomprises a handle operable to withdraw the pin head from the groove ofthe latch screw member, and in which the body of the locking screw isformed with means for restraining engagement of the withdrawn pin so asto hold the latter in its retracted position against the spring action.

7. Door fastener operating means according to claim 2, and which furtherincludes a pressure sleeve interposed between said portion of the latchscrew member and said spring means for imparting pressure from thespring to the latch screw member and from the latch screw member to thespring, said sleeve also being disposed between said boss and the latchand being capable of axial displacement relative to the boss and thelatch, when the door is in closed condition, to exert pressure on thespring means on axial adjustment of the latch screw member to thesleeve.

8. Door fastener operating means according to claim 7, in which thesleeve is provided with a member to abut the latch, on axial movement ofthe sleeve, with a clearance between the abutting member of the sleeveand the latch, which clearance is less than the distance of axial travelnormally required of the sleeve to compress the spring means inunlatching the door.

9. Door fastener operating means according to claim 8, in which theclosure spring means is mounted between a shoulder on said boss and adisc which is applied against the latch in the closed condition of themechanism.

'10. Door fastener operating means for the door of a horizontal cokingoven according to claim 7, and in which the sleeve is also accessible toauxiliary mechanical means for operation thereby for compressing theclosure spring means independently of its operation by said latch screwmember.

References Cited in the file of this patent UNITED STATES PATENTS

